Question

1.viết phân số từ bé đến lớn.

11/18,14/15,7/9

2.tính

4/9+3/7          5/6-3/8        18/25x15/6          30/49:6/7

Answer 1

1.\(\dfrac{11}{18};\dfrac{7}{9};\dfrac{14}{15}\)

2.\(\dfrac{4}{9}+\dfrac{3}{7}=\dfrac{28}{63}+\dfrac{27}{63}=\dfrac{55}{63}\)

\(\dfrac{5}{6}-\dfrac{3}{8}=\dfrac{20}{24}-\dfrac{9}{24}=\dfrac{11}{24}\)

\(\dfrac{18}{25}\cdot\dfrac{15}{6}=\dfrac{18\cdot15}{25\cdot6}=\dfrac{270}{150}=\dfrac{9}{5}\)

\(\dfrac{30}{49}:\dfrac{6}{7}=\dfrac{30}{49}\cdot\dfrac{7}{6}=\dfrac{30\cdot7}{49\cdot6}=\dfrac{210}{294}=\dfrac{5}{7}\)

Answer 2

2:

a: =28/63+27/63=55/63

b: =20/24-9/24=11/24

c: =270/150=9/5

d: \(=\dfrac{30}{49}\cdot\dfrac{7}{6}=\dfrac{1}{7}\cdot5=\dfrac{5}{7}\)